changing files once downloaded

I finally figured out how to use the ftp program. I even downloaded the file I wanted to view. I cannot open it. I assume I need some kind of program to view files once downloaded from the server. I did a search and couldn't find what I am looking for. Can someone tell me what it is, or did I do something wrong?

I am having a problem in my admin area. I went to add some coding and the page went blank when you view live. I cannot change it back because in admin the save, reset and cancel buttons are no longer showing. It shows for all other pages in define editor but not the one I was working on. I figured now was the time to figure out how to upload using filezilla so I can get that page and at least fix it...(its my home page). I downloaded the file but now I cannot open it. If you can solve either of my problems I would really appreciate it.
:frusty:

you can use notepad to edit files, don't use wordpad or word. I use notepad++ as it uses highlighting and line numbers.

Sometime I have found if I put bad code in the define pages editor I get some interesting behavior from the admin editor page. The file for the home page of your cart is in includes/languages/english/html_includes/define_main_page.php.....but you should be making an overrides directory includes/languages/english/htm_include/YOUR_CUSTOM_TEMPLATE/define_main_page.php

Thanks so much. Turns out it was css coding which is no good for the zen cart. I learned the hard way. Now I am off to figure out more on zen.